/usr/share/doc/gir1.2-gnomedesktop-3.0/README is in gir1.2-gnomedesktop-3.0 3.18.2-1ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/gir1.2-gnomedesktop-3.0/../libgnome-desktop-3-12/README